Racer Brown ST-21

Budget 340 build. ( dads old parts/some new)
I have a ST21 solid that my dad ran in his old back up 360 Dirt motor.
He thinks it would run great in my set up. I am just worried i could be killing my power out put with a cam i don't know much about.

according to 4seconds flat

ST-21
254
int
554
ext
520
22-26
10.5-13.0
4.10-4.88
3500-4500
They say 1.6 on the intake 1.5 exhaust. I only have 1.5 "273" rockers. will this hurt or help?

But after a search on here i came up with these specs
A Eng. P3412016 ST21-108 286 .520" 110 .018 .022 http://www.forabodiesonly.com/mopar/showthread.php?t=83966&highlight=ST21

Vehicle
Valiant-3100lbs Think Green Brick but with a few better suspension parts
3.90s-225-50-15's
TKO600 road race Over drive/alum flywheel/shaft
69 340 .30 over
Eagle SIRs
KB243's
LD340
70's 360 Smog heads with 1.88 intake fresh (long story, got ripped off. was told they had 2.02's and bowl port. would love an opinion on them also. Ether have them worked or run them and save for Eddys)

I finally got my car to a point i could drive it and did a few AutoX's this summer, But ended up dropping a valve in the 318. This car will see the street but i dont care about rough idle. Car will be seeing HPDE track days OFTEN.

Thanks Fabo.