Newbie with a suspension question

[WillemV8]

Hey guys, figured I'd post my question here, since getting my truck to hook up is part of my problem, and you guys know a thing or two about hooking.

My truck is a '85 ex-army truck. Its 4x4, and its been lifted about 4". It has 3" blocks under the rear springs. 33" tires, going to 37".

Ever since I swapped out the 6.2 diesel for a mild 454 BBC, I can't go WOT anymore from a stop without getting severe axlehop. Is there a way to solve this?

I drive it on the street only, no off-roading for me. The goal with this truck is to build sort of a sleeper, a big not so pretty truck that'll leave most cars in the dust.

Thanks!