David, I can't remember if I have asked you this but have you checked out this site?
https://www.britishv8.org/
I use to be an active member many many years ago, put a Ford 302 V8 into a TR6, it was a rocket.
But the vast majority of the forum have MGB-V8's with the old Rover 215 V8 for an engine.
The B's handle the extra power quite well, not so much for the TR6's, I had to do extensive mods to control the torque steer.
Oh yes...I have been all over that forum. A V8 TR6 would be a fun car.
When I got the car one of the things I wanted was either and overdrive transmission or a 5-speed.
I looked at all the transmission options available.
- Vitesse Miata 5-speed - basically $10KCAD Basically a bolt in arrangement but for 10K it ought to be
😱
- Hi-Gear T9 conversion - $8000CAD Highly regarded but $8000?
- Rivergate 280ZX conversion - $1900CAD plus an unobtanium 280ZX transmission (plus I read about some dodgy installation issues)
- Dellow trans adapter for a Toyota T50 transmission $1000CAD plus used transmission for $1000-2000CAD plus whatever clutch shenanigans are required. Pretty much roll your own.
Then I lucked into finding out about Quantum Mechanics in CT. Bought a fully rebuilt (every wear item replaced) Laycock overdrive transmission for $3000CAD. Direct bolt in, the wiring harness is already in the car from the factory. Transmission came with correct gearing for my speedo and the required longer speedo cable.
But before I found the overdrive transmission I was very, very close to buying a V6 Camaro engine and a T5 transmission to swap in. A company in the interior makes the mounts, and headers to make the swap pretty much a bolt in affair. But then I would have to go through the V6 and freshen it up. The engine in the B has excellent compression, over 150 PSI hot, with about 2 PSI difference across all four cylinders.
I'm actively investigating adding an Eaton M45 supercharger, intercooler to make a blow through setup. Would add about 25-30hp at the rear wheels Used super charger is about $350, used intercooler another $200, piping another 200 or so. I need to make a manifold adapter but that path has already been cleared by a fellow in the US which put an M45 on his MG Midget.
DIY Supercharger Conversion with Intercooler for MG Midget, Austin Healey Sprite, and Morris Minor - Overview
www.creativespridgets.com