340 Cam, rocker, valve spring questions

The build is a mild 340, Speed pro 10.1 pistons 60 over, stock rods, 65 ish CC mildly ported 202 jhead, performer RPM, no carb yet but leaning 750 DP,

Q1- picked up this and a few 340s in a lot it came with few sets of 273 rockers, other than cupped push rods are there any other issues running these?

Q2- the heads had been rebuilt when I got them but didn’t know the history on them so I had a sho check them out, was going to replace the springs but the shop said they checked the springs and there good, if u get a spring cam lifter combo is it still nessesary to check or “set up” new springs?

Q3- the cam..... the shop said the max lift was around 490, looking at the comp x 274/286 .488/.491, but had heard good things about the purple or comparable spec half the price comp nostalgia 284/291 .484/.484, or the thumper 279/296 .486/.473, is it better to get max lift like the compx or sacerfice a little lift for more int/ex like the other two, or am I splitting hairs and these r close to the point where they would be about the same?


Any and all info is appreciated, thanks