Just bought another engine and box
Going from the current VP Buick 3.8 and 700r4 to a VS ecotec 3.8 and 4L60E

Basically the same set up but improved a little which ticks several boxes of my wants

Later engine runs sequential injection rather than batch fire, has higher compression ratio, more aftermarket parts and parts are easier to find (the old Buick is getting rare on the ground) and I can datalog from the later ecuuch easier.
Power is up about 17kw so I'll be at about 200hp out of the box, which is a cheaper upgrade than a cam for the Buick
Lean cruise for economy. With the cost of gas here old be saving about $5 per 100km so at $500 for the engine, box, loom and ECU it will pay for itself real quick even if I keep the old set up.
Really want the extra km per tank. 350km Is a bit short ATM.

Things I will need to change
Engine out (was doing some that anyway to panel and paint the bay)
Run new loom (again was going to do that anyway with the VP loom to tidy everything up, old just have another day of stripping the new loom to its basics)
700r4 box is hydro controlled new one is electrically, but I have all the loom and ECU so that's no drama
Will need to get vats (security codes) turned off on the ECU chip. Not a problem I will probably buy a cheap chip burner and custom a tune while I'm at it (vats may even be turned off in it already I will check)
My Speedo is totally adjustable so no dramas there
Ecotec comes on power a bit later than the Buick, so I may as well throw a shift kit in while it's on the stand, just a towing spec one. As well as a trans temp and engine oil temp gauge.

Oh and because my truck is certified for a 3.8 V6 and 4speed Holden auto I can get away without recertification
Nice one