L31 is the V8 5.7L vortec
ccm (car craft magazine)
885, 062 and 906 are casting numbers
pauly can elaborate on the camshaft profile.
sumptin' like 197/203° .397/.412 lift??
dunna know if anyone actually flowed the vortec manifold.
but thats not the short side of the system. FUEL
your injection system is like a 19lb/hr flow rate.
(305 tuned port camaro/firbirds had 19lb/hr injectors)
so fueling high horsepower can be a problem.