More questions lol

Hey,

Anyway thx for allt hat helped me before..but now that I hvae some things figured out..what do you guys thing I should mod first...Im jsut fine with my suspension for now(used to driving top heavy suvs) But I have 120k plus miles on my engine ..should I start like umm building up the engine and replacing soon to be dead parts or would I be better off waiting for it to hit the bucket and just swap a new one in..like which would be cheaper/reliable.

TweaK- (another dumb question lol)