I have a 200r4 out of an '86 Grand National that I recently had rebuilt but never installed. It has dual bolt patterns for Chevy & BOP. I had a local shop do a performance rebuild with typical mod upgrades including a Transgo shift kit, Red Alto wide band, GN servo, reworked pump, new clutches/steels, new TCC, hardened stator tube, 2600 stall L/U converter, etc. With parts and labor, I have right at $1k in it. My plans have changed and I believe a TH400 would be a better choice for my application. Just install and ride. $650.