LS3 or LS1, Carb or EFI, 6spd MT or 700R4?

[a1960apache]

I am building a 66 shortbed that I plan to drive a lot and put in a few shows. I started looking at used LS1, LS3 with trans and not sure what exactly I would be getting and what I would need to still buy. Then I have been looking at a new LS3 with AT. I also looked at rebuilt motors and trans and wonder how much I would really save in the long run as far as the life of the motor/trans since I plan to keep it a long time, plus all the unknowns of what I would still need to buy. I have been reading as many post's on the subject and just seem to get a headache with all the variables!

I am actually leaning towards a rebuilt LS1 long block, upgrade the cam, maybe put a FAST or Holley EFI, or carb and distributor, and either one with just a 700R4 seems like it would be the cheapest and also something different. I would actually like a 5 or 6 speed MT if the linkage or hydraulics wouldn't be a nightmare.

Anyway, any input based on what route you took and what you would have done different if you could do it all over again.

I kind of like the looks of the orange and green engines with the old style valve covers to look as close to the old, early 55+ V8 with the big black air cleaner. EFI is cool, but I hate all those wires and harnesses, you either have to get rid of them or cover them all up.

Thanks in advance.