a different kind of switch

Hello all, new guy here. So im pretty good with a wrench, but ive come to a situation im not grasping. I have a 1988 Dodge W250 Gasser. 360 with a swirlport build. I pulled the NP 435 out and replaced it with a 94 A518 46RH. viper 2 series from PATC. everything runs great till i hit the gas... with mild petal it accelerates through all the gears no issue. but the moment i give it any kinda real gas i get a loud clicking noise coming from the torque converter area. Not sure whats going on with it. if memory serves me right the torque converter stall speed is about 2000-2200. I only drove it down the block and back as when i heard the noise i slowed down, it went away and i gently parked it back in the barn. any thoughts? something i missed maybe?

1988 Dodge W250 Power Ram
360 bored block crank turned and polished
91' Swirlport heads Valves opened to 2.02 Int 1.96 Ext ported and polished
bored .030 Kieth black hyporetic pistons
Comp Cam .430/.450 lift 260/268 duration 110 lsa 108 degrees centerline
Edelbrock Performer intake
FI Tech 400-600hp go street fuel injection
Lokar Ratfink on the floor shifter
1 3/4 hooker headers to indepentdent dual cherry bombed exhaust
PATC Viper 2 series A518 46 RH transmission
NP 241D transfer case