purcashing 1987 toyota supra soon, YAY! HG questions inside.

[SideWinderGX]

k, just as the title says basically. before i say anything, i want to apologize if my main question has already been asked (it probably has), but i want to be as CLEAR AS POSSIBLE on this supra as i love skylines and supras, and want to take care of this for as long as possible.

saw it today, great shape, yadda yadda, rebuilt (or new, i forgot) engine with 100k miles on it, 7mgte engine with ct27 turbo (steel, not ceramic). the only thing worrying me is the head gasket problem.

my dad flipped out when i mentioned possibly bad headgaskets, because you have to rip the entire engine apart apparently. from what ive read, the block is iron and the head is aluminum, and electrolysis will slowly wear it away, the iron will degrade, etc. once i found out if the headgaskets are in good working condition or if they got replaced, ill go from there. but lets assume they ahvent. first, what should i buy to replace the problematic headgaskets? ive heard steel headgaskets and ARP studs, correct me if im wrong. secondly, how much will that ring up to? id rather not spend 2 or 3 grand on the car right off the bat, but if i need to ill put that into consideration.

thank you very much for any input, i appreciate it greatly! i should have the supra in my hands in 2 to 3 weeks

edit: the headgaskets, at this moment, are fine. the car runs immaculate. i just dont want a HG problem in the future, and would like to avoid the trouble.