Foxes don't run toooooo bad so I wouldn't give them that much shit.
I'd look into the basic boltons of exhaust and gears. The car will be pretty fun to drive without getting in over your head.
My brothers with a timing adavance and shortys/hpipe was running faster than my LT1 and he still had junk 2:73s (he was trapping @98mph like that)
I'd do that + slicks and nitrous and just have fun.
H/C/I will put you right at or a little over 300rwhp depending on the combo or where you dyno at. There's always someone faster no matter what. I'd look into a power adder if he wants to get serious....single turbo kits are getting relatively inexpensive for these and people are netting upwards of 400whp on stock everything.
A bonus is you can work on them without going insane (insert fbody jokes here

)
It whistles while it WORKS.
I suck.