Being a cleveland junky and having a massive stash of the stuff, I can give a little insight into them. The 4vcc head when the intake is epoxied and the exhaust floor welded up is better than 95% of common aftermarket windsor heads. Forget flow numbers, it's all in the canted valve. As for the 2bbl heads, the only 2bbl I would ever consider is the closed chamber aussie head. Im MAX ported configuration they are only good enough to sustain 500hp MAX, the us 2bbl open heads IMO are useless to use. You can use 4bbl cc heads with minor work on the street. I get so tired of hearing they are no good, produce no tq etc etc. I have used them for years on the street.
As for the blocks, the 4 bolt is no better than the 2 bolt, I have ran each one to 8900+ rpm drag racing for seasons, they both lived fine. If you are opposed to using a 4vcc head on the street, use the aussie 2vcc head.
As for clevors, your intake choices are many since you can run intake plates still made by price motorsports, if you want a track boss intake from the 80's I just talked to the owner and he still has a basement full of them.
