i want to build and engine with a streetport, but i want to keep my expences to a minimum i'd rather buy a TII 4port for my carburated application. but i need to use a s5 rotating assembly, so im thinking why not port a s5 motor all together, or use my s4 even.....

so my question is, ive been told there is little to no room to port out a 6 port. is this true? what can you do with a 6 port engine?