I'm building a 327 in a 67 camaro for street. Wanting to keep numbers matching drive train and upgrade at a modest cost. I'd like some perspective on this proposed list of upgrades:
327 Bored .030 over
Flat top pistons 4 valve relief
COMP Cam CL12-212-2, Magnum Hydraulic Cam and Lifters, Duration:280, 0.480 int./0.480 exh., Lobe Sep:110
ProMaxx Vortex 64cc iron heads
Intake Runner: 185cc, Exhaust Runner: 60cc, Intake Valve: 2.02", Exhaust Valve: 1.60"
Max. Valve Spring Lift: 0.575
COMP Cam Magnum Steel Roller Tip Rockers, 1.52 ratio
Comp Cam 7812-16 -5/16 in. X 7.794 in. Steel pushrods
Edelbrock Performer EPS Dual plane intake - Idle-5,000
Holley 510-0-80457S - CFM600 4 barrel
SUM-850001R HEI distributor
Boss Hog Night Stalker Torque Converter - 34041
2 speed power glide Trans
2.73:1 highway gears
26" tires
Need to maintain vacuum for power brakes as well. Also, curious if anyone knows the compression and/or horsepower with this setup.
Any input is appreciated.

 

With true flat top pistons, the compression will be up there, and you're definitely going to be on a strict diet of premium gas. I'd guess 10.25 c.r. with the small 64cc chamber heads. If you're driving the car much, you might want a little dish to the pistons, like 5cc, to make it more pump gas friendly.
If your budget allows, I'd also go with a roller cam, vs. a stock type flat tappet. Howards Cams has some very nice retrofit roller cam kits for just under $600 that will give your engine a lot longer life, and trouble free operation, without losing vacuum, or idling too radical.

 

Thanks a lot. One clarification: the pistons are flat top with 4 valve relief. Do you know how to calculate that?

 

Piston manf should have this info, But I would suggest -12CC.
Don't forget OE piston depth in cylinder is 0.025", unless block has been decked.
Head gasket thickness is also needed for volume.
Also, if crankshaft is offset ground on rod journals, this must be taken into consideration.