I know that either the 3bar or 4bar heads need upgraded springs not sure which or if I need to replace the ones in the new 4bar heads I purchased? Also what kind of head gaskets should I go for? Heres a link to the heads I bought. http://www.ebay.com/itm/271159493423?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 also a link to the gaskets I was looking at but I'm not sure about them. http://www.ebay.com/itm/190734953142?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 Last quick question not to do with heads at all. Awhile back I bought GT40 upper and Lower intakes and the throttle body adapter elbow. My throttle cable is really loose. Should I go ahead and buy a TB spacer?