Best engine upgrade for stock 390?
well theres a couple of things on a 390 that can be changed out from stock(bolt on that is) to get better performance. ideally youd want to uprade all three areas if possible. 1st being the exhaust manifolds, those cast iron logs suck. if you can find a set of headers for your car do so. now i know your probably thinking headers, oh no! i dont wanna go through that hassle! well as much of a pain in the ass they can be to install, they are well worth it on a FE(thats a 390). 2nd you can upgrade your intake, the edelbrock performer isnt much in the way of perfromance. bout the only advantage to it is the weight savings wich i doubt will mean much to you. that and the fact that you can use a 4bbl carb. the edelbrock performer flows about the same as a stock intake. you'd be better off with a performer rpm, some people belive its overkill because of the advertised 1500 and up rpm range. it will still be fine below that. also it doesnt have the heat riser passages wich could be a problem on a daily driver in cold weather. now you could find an old police intercepter intake or cj intake which are both good stock manifolds. you can find em on ebay from time to time, but will prolly cost you as much as a rpm intake or more so why not go brand new, same performance or better, and prolly cost less. 3rd you could upgrade your ignition, im guessing your still running points. you can upgrade your dizzy, coil, wires, or even put in a msd box. which with out changing intake and exhaust wont show the biggest gains. but will still increase performance, and better gas milage which with todays prices is a good thing!