68 C20 Longhorn questions

[1FaastC10]

my buddy called me up on Friday to tell me about the new toy that he traded his old dirtbike for. he told me it was a 3/4 ton 2wd, with a blown 327 in it (broken, not supercharged). on the phone he told me there was something funny about it, he said the bed looked like someone had added a section to it. i went over to take a look at it today, and sure enough, its a Longhorn, and a damn solid one at that! the cab needs some attention, but the bed is very solid, despite some body damage (big dents in the lower bedsides, but no creases, should be easy to pull out.) overall, its in good condition for this area.

a couple of the questions that came up are regarding the trans and the front suspension. he will be getting a mid 70s 3/4 ton truck with a big block and a 465 in it. his plans are to use the big block, will the 465 fit in the place of the stock trans? it is a 3 speed floor shift unit, and appears to be stock.

will the front suspension from the 3/4 ton bolt in place of the stock suspension? the donor truck has all good suspension, and disc brakes up front. i know the 73-87 1/2 ton units will bolt right in to a 67-72 no problems, are the 3/4s the same? also, what rear should be in this truck? how strong is it? he is planning on putting it together for a tow rig.