Is it just me, or does 75 horsepower from a set of heads and under-drive pulleys sound kinda high?

Its a little on the high side.

However.

I had a stock car that made 220 rwhp and put heads,cam,intake and the rest fo the bolt ons on it and it made 312rwhp

Like I said above, depends on that cam. Description was a bit vague:
The old Wolverine 1087 cam, with Holley intake and Twisted wedges or equivalent could contribute to 320 at the tires. The Lunati 51017 is a badass too.

not to mention the 1/8 inch of clearance:D

:doh:

:rofl:

i had an 1/8 of an inch putty on top of the piston to check the piston to valve clearance. and as far as cam specs the guy i bought the car from said that the comp cam in my motor was a little bigger than the b letter cam. i dont expect to see more than around 290 at the wheels. and the reason i was going to get some race gas was to nock the timing up a bit. i was going to tune my car for 93 on the street then have one where i put like 3 gallons of 110 in it and see if it would help it from spark nocking to get a couple of more degrees of base timing.

So you turned the motor over by hand, with the pushrods, lifters, rockers all working and it was all-clear by that much?? Then you're fine.

oh yeah well now i know i have plenty of room for at least one more upgrade.....

I don't know about that. It all depends on how accurate his reading was and whether or not he used a solid lifter to take the measurement.

If it's only .125" on the exhaust side, that may be a little close. I would recommend throwing a solid lifter in there and some test springs on the heads and check it more accurately.