Moving forward with the plan, Ive decided on the 700R4 four speed auto, (also known as a 4L60) - I had a rough decision between the three speed and four, but after reading more of Delmo's builds, I decided if Del runs it then theres my answer.
I ordered a Jasper unit, came with the installation kit, and best yet - they are produced/rebuilt in the USA.
Also, picked up a nice piece for myself that Ive been eyeing for a very long time, the Sniper EFI. Now I just need to figure out plumbing and such.