A turbo is always the way to go not super charged, the 4.3 would be good but for cheap the 2.2 with forged pistons, total rebuild, a T3 35r turbo and a new set of injectors, with an 8,000 rpm rev limiter wounld give you amazing power for cheap. i have a 2.2 and pistons cost $300, cam was $300, Turbo kit was $2000. a 4.3 should be around the same cose for you but you will have to add cost for motor, tranny and mounts.