If it wiped out a lobe, wouldn't it be acting up even when slowly revving from low-high rpm's, not just when quickly revving it?

Is the cam a WG1107 or a WG1108? And is there any chance one or two of your lifters aren't pumped up.

Cam is the 1108. Not sure about the lifters?

Also, if it is a lobe on the camshaft, is there a way to tell w/o tearing the motor apart again? Not sure if it would work, but it seems like I could pull the plug wires off one at a time and see if it quits doing it with one of them??? Would this be possible, or is my brain fried pie from all the thinking it's done today?

Thank ya'll so much for the help so far!

back firing
 

Sounds like a valve train issue to me. If it is back firing through the carb under load. I have had the same thing happen with a fresh set of rebuilt heads, the valves were not cut right and it would run fine at idle but when it was put under a load it would start popping. Just a thought ?

John, when you put the timing chain on is there any chance you got the timing marks off?

I'm starting to agree with bjuice.

Just my opinion but my next four steps would be.
1. borrow your dads carb for a second to eliminate your carb.
2. pull your valve covers to see if all the rocker arms look like their
moving the same amount.
3. check your timing chain to make sure your dots are lined up at tdc.
4. do a compression check on all cylinders to see if they are the same.
The compression check will tell you if you have a valve leaking.

Yep, I ws hoping that it was a carb or ignition problem, but it aint looking too good for that. When you pull your rocker covers, put a dial indicator on the rockers. You can check lobe lift at the pushrod end, or valve lift at the valve end. Compare in. to in., and ex. to ex. as I believe you said it was a duel pattern cam. this will tell "FOR SHORE" if you have a flat lobe or one that is going flat.

that won't work if it is a cam lobe....exhaust valve probably not opening (worn lobe) so when the intake valve opens it goes that way...just my thoughts ...not as experienced as most here are.

If it was a totally flat lobe it would be hissing back thru the carb at idle or low rpm something you could definately hear, not to say it's not, a compression check would definately tell that story, what no one has mentioned if a week or broken valve spring, just a thought, because i too have no idea what the problem is without looking at it and investigating it myself.

JMO

Zip.

GOOGLE CRANE CAMS WG1108K Then click on the top choice (Jeg's) and look at *** NOTE. I'm with Gimmemud , something is wrong in the the adjustment of an intake valve. Too much preload on an intake lifter ???

Very good advice DADMOD and your first post. I got the noted part DADMOD had referred to.

***Note: To provide the most accurate valve adjustment on hydraulic lifter camshafts, the heads must be machined to accept screw-in studs (on engines not originally equipped). On engines equipped with bottleneck type studs, using 270-99768-16 positive locking nuts will permit valve adjustment. For engines equipped with pedestal mounted rocker arms and hydraulic lifters, excessive lifter preload can be easily remedied by using Crane's rocker arm pedestal shim kit 270-99170-1. Crane offers a pushrod guideplate and rocker arm stud conversion kit 270-36655-16 for street applications, enabling the 1977-00 302ci and 351W engines with pedestal mounted rockers to have adjustable rocker arms without cylinder head removal or machining.