Re: vortec heads
Yes, The vortec heads have smaller combustion chambers (64cc's to boost your compression) and larger runners (170cc's for better flow) then most older heads. The biggest problem with vortec heads is that you must use a vortec intake manifold and center bolt valve covers. If you need those too, then its a wash. A set of iron Darts or RHS Pro-Action heads may be cheaper.
69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 TPI transmission, 12-bolt w/Eaton 4.11:1