i know they are low impedence, thats not the problem, i was wondering if i would hav a problem fitting them into the manifold.... the guy at msd said they are universal, but resemble a delco injector, similar to a gm... going to be running about 14lb now but going to up grade my blower to a ysi trim 18lb probally...... just bought a iron eagle boss block and scat forged rotating assembally ross pistons..331..custom grind cam.... magnafuel fuelsys. 575 series pump.... want to make 700+ hp