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.