Hey Guys I need some help. I am building a big block chevy it is a 1978 TD 427. Only the block was good when I got it. I have had it machined for a stroker crank and bored over. It will be about 505ci. I am torn between oval or rectangle port heads. I do not expect it to be ran over 5500-6000 rpms. I was thinking of running a supercharger on it but not sure.