my concern was with the stock 351c 2v VS vs 351c 4v which one is easier to tweak.
From what I have been reading some aluminum intakes will work on 2v heads and 4 v heads and some won't.
I guess my best bet would be a cam and heads and intake with a 600 or 650 Holley. My last car was a 61 ford with a built 460 motor the guy made claims of nearly 500hp. One thing is this Cleveland 2v is half that,, this car is so slow it's embarrassing.
In regards to rarity I was referring to the 3/4 Vinyl top and tilt, since I live here in the Motor City I have car clubs every night at many locations and never seen a Vinyl top yet. A customer of the shop with a 1973 Mach 1 convertible told me how rare this was.