i set a 305 700r4 in my 88 jimmy, i used stock exh. manifolds. heres my question how close to the firewall should the hei dist. be? the reason i'm asking is i slid it back to clear the long water pump but it looks like i'm going to have to use a floor shifter, i don't have mine hooked up but the manifold has it against (spelling it's been a long day) the firewall. i'm making my own mounts so any info would be great. thanks in advance.