If i was doing the swap with 15 g id go with a rb25 clip and a 240 roller.more parts swapped over to the 240 the better.you still need a mount kit i think.syko sells one for it.you still would have money for upgrades to the rest of the chassis
If he stays with the SR20 he won't need a mount kit or a drive shaft. To be honest he just needs to find a good clean car before anything happens. That will be the expensive part, Look into S14's too.
I do not really like the newer 240s i prefer the hatch type. Just like the looks better overall. I like the s14 front does just think the rear ends are ugly don t care for the tail lights. Probly a stupid question but would it be worth rebuilding the sr20 in my 97 ser to put that in a 240?