your thoughts

It will go faster with it, or you'll grenade it. You certainly don't need any kits to run the number you want to. Factory heads, even bad ones, can move the air you need to to make the steam required to run the numbers in a race-matched combo. Not in a street car combo, but with deeper gears, if it can hold together (and I think it probably could if it's a servicable lower end) you're good.