12 bolt questions.

[mbc9ieII]

i am on a tight budget right now. but I have alot of choices. i have a 69 C10 3 speed 12 bolt with 6 lug. the question i have is, i have 6 lug rims. My rear is single traction. I do have a spare single traction rear - 5 lug and just purchased for almost nothing another 12 bolt 5-lug welded posi rear. i also have a swiss cheese 1977 El Camino SS (as its marked on the interior with ss badges and has a 350 and it is a 12 bolt. and supposed to be a posi unit.

Is the El Camino's rear a 12 bolt truck rear or a 12 bolt car rear? i have 3 sets of 5 lug rims. and 2 sets of 5 lug front disc front ends (the whole nine yards) that need rebuilding and my 69 6 lug drum front end is new so i really dont wanna waste the money i put into that.

Again money is tight so i want to make the best desicion........ Is there a cheap way to turn my rear into posi, or is the welded posi with a 5 to 6 lug adapters the to go or is it way to dangerous to have for the occasional drive to work and back and car show. Or does anyone know what the 12 bolt in the el camino is. i can probably get wheel adaptors from 5 to 6 lug. i think the rear is about 1 and a 1/2 inches narrower then the truck rear so the spacers will make up for that. . so what is the best rout?

cheap spool or posi for the 6 lug...? welded rear and adapter????? or the El camino 12 bolt with a adaptor?

Thanks guys