Just picked up a set of Bac Man Chevy heads, they came as a package deal with a slough of other parts, wondering if anyone can tell me anything about them? All the seller new was that the took 2.5" intake valves and used 1/2" head studs(came off a rodeck block). Does anybody know what intake manifolds might work with these? They came with a magnesium blower intake but it doesn't have a burst panel, and there doesn't appear to enough material to machine one in, not sure if trying to weld a frame on would be possible. The intake bolt spacing is 5" OC and the ports are also 5" OC, thanks.