C'mon Help a newbie out!!!

[Newold65]

So here's where I'm at. Took a 65 c10 frame and body and pulled the motor out of a 84 suburban C20 a 454 to be exact with the 400 tranny that was with it. Only unfortunate thing is neither one had the original driveshafts. So my question is what type of driveshaft to use Single or dual and what would be a good donor to get it out of. Oh btw measured from the end of the trans to the middle of where the carrier bearing goes and it was like 1ft 4 in and then from carrier bearing to rear end was 3ft 4 in. I'll get some pics on here soon and maybe even a video. Thanks for the help in advance.