my engines not quite in yet just sitting waiting .... so much to do! haha but yeah don't think theres going to be much clearance there maybe 5 -10 mm if that,not to worry my pics are in the gallery under jdm55,,, yeah you should definatley upgrade your fuel line 8-10 mm should be plenty, use steel bundy line,should be able to get it at repco or a hose joint over there,can't remember if rotors use a return line been a long time since played with them,i think some where i read you can blank off the return on the carb if its not already got a blanking plate on it,??? not 100percent ,but your holley should do the trick , keep up the good work love to see pics!!!