so now I have had my car on the road for the summer with the 350 and I have been enjoying having an ounce of power for once in the car. It was fun having something under my foot but I am feeling the need for speed some here (I thought I would be good with the stock 350, silly me) I am buying a set of #5 heads from a late 60's small block for 200 shipped and planon doing them this winter. I talked to a machinist (the best around) and he said with these heads and them being designed for leaded gas, if they are sealing now; I could very well be better off not doing a 3 angle valve job because the valve seats have been tempered through the years and now would be more applicable to todays unleaded gas. This would obviously be friendly to my budget and I am hoping i can walk out of the machinist with this being the case. any input here? I am planning on getting new valve seals and stiffer springs and after that i want to be all set with these heads (along with expanding the head bolt holes to 1/2 inch) I want to add a mild cam to the engine to go along with the heads and the older edelbrock OL4B intake that i picked up for cheap.
any input on what else i might want to do with the upgrades, lifters timing chain,etc. as of now i kind of want to stick with the timing chain that i have if I find when i get it apart that there is no unusual slack. Also i keep hearing of non metal timing gears, not sure if there is any truth to any of this. anyways any input would be appreciated