Turbo Action 17156 on a mild 340 street Duster?. Help

Hi gang- so im confused and brand new to RMVB. Scrounging together a ratty Duster rebuilt 340, x heads, headers, whiplash cam, 750 cfm, rebuilt tf904, 2500 converter, 3.71 suregrip. Just want to do burnouts with my kids and try autostick out. I bought a Turbo Action 17156 rmvb without realizing it doesnt have low band apply. Do i just move forward and install it as is for a streetable car? Do I need a new sprague and billet accumulator?
Or do I cut bait, sell it and buy a RMVB with low band apply? Im a poor high school teacher so I need the most bang on low bucks. Also how do you break engine or trans without the low band apply?- ive driven neither, i just ASSumed it was plug n play manually shift gears. Longwinded sorry- thanks a ton