I am putting together a 440 six pack to be mounted in my 71 Challenger 4 speed. I have started from a bare block, had some TRW 2295 pistons, a set of newly rebuilt 80 cc heads, six pack rods, balancer and flywheel, and a Comp Cam 274 cam. What kind of valve springs and pushrod shall I use? I don't have an idea about the valve springs already mounted in the heads, they were purchased many years ago off ebay. Also, shall I use 3/8 or 5/16 pushrods? Rocker arms are the stock units. I plan on using the original valve covers, if this matters.
Any suggestion about pushrods and valve springs. Living in Italy makes everything more difficult. Thank you for the help