LT4/8L90 into 1966 C10

[hddoktr5]

Howdy folks ! My first visit so thanks in advance for your patience!
I bought a connect and cruise package that has engine , trans, ECU
and TCM . (Think the acronyms are correct!) Anyway, I want a floor
shifter with tap up/down feature on the shift knob . I also want it to
be a GM product. Primarily just for future support. GM Performance
asks that you “contact your dealer” . Not much response there.
Any help would be appreciated!