He's so nice he answered twice
, I've been playing with an EFI system on a Clifford manifold because it had the injector bungs cast into it, but expierienced rough running until I got into higher RPM's, I believe because of the siamesed ports, TLowe has experimented with EFI and solved the low RPM rough running with port dividers that are welded into the ports. A throttle body would give pretty good results ithout too much aditional work.