GA16DE in B310
How to adapt an A-series transmission* bolt up 3 bolts
* (optional) redrill 4th bolt
* machine GA flywheel to accept A12/A14/A15 flywheel ring gear
* grind GA block corner where A-series starter fits
* Cut extra length off the A-series spigot (or drill the GA crank deeper)
* Use pilot bushing 1/2" x 3/4" cut to length (0.69 inch)