I have someone building a SBC 350 with .040 overbore for my '54 Chevy PU. We plan to use a Comp cam, no. 112-238-2, with specs below, roller rockers, Speed Pro flat top pistons with four valve reliefs and 487 heads with 76CC chamber, shaved .050, with 1.92/1.50 valves. An Edelbrock Performer intake will be used with a Holley 650 along with long tube headers.

Cam Specs
Intake Exhaust Gross valve lift 0.462 0.469
Lobe lift 0.308 0.313
Duration at .05 218 270

Piston Specs COMPRESSION
Comp Ht. Dome Vol 64CC 72CC 76CC
1.560" -5CC 9.4 8.7 8.3

My questions are 1) Will I have valve clearance problems?, 2) What compression ratio will I end up with, and 3) Will the intake manifold and possibly the headers need to be shaved to match up properly?