hello everyone, im new to the forumn and need some advice. I live in the uk and just imported a 240z with a 327 chevy v8 in it, and to be honest i have no knowledge on the sbc engine at all. But its a 327 block date of manufacture is 1962, the inlet manifold number says it is a 350-400 cubic inch manifold date around 1969 got the oil filler neck on, would this help with horse power having bigger manifold or not, also it has the edelbrock 4 bbl 600cfm carburator on runs ok but im confused as to how this carb works, it would appear that it runs on the front 2 ports during normal driving then when you excelerate hard the rear 2 ports also come on line, thing is the rear 2 ports only come on when excelerator is nearly all the way down, but it could be adapted to come on sooner or would this not work due to say the power curve comming on to soon bogging the engine down, also the rear 2 ports have a flap on them with weights on that move freely what is the purpose of this any advice would be appreciated regards 240zchevy v8