I don't think the 302 can be done for under $3000. The 3.4 definitely could be...

To do it my way, you'd spend freaking MONTHS fabbing up brackets... any sane person would look to the Explorer/SN95 front accessory dress, which would run you about $750 (less if you're a gifted parts hound). The LT1/LS1 and its very compact accessories is a much easier swap IMHO. Either setup will require you to mount your radiator in front of the front bulkhead and do a bit of clearance work on the back of the grill.

Tranny setup my way will cost you $500 and another coupla months, assuming access to a decent shop with a large mill (CNC not required)... and then you'll need anothr $250 for the clutch/pressure plate setup (more adapting, but that's the parts-hound discount price there. Much easier to spend more!). Probably plan on a mostly-replaced/rebuilt cluthc hydraulic setup to swing the longer clutch fork through a longer arc (plan on a ballpark of $200).

Note -- I am generally optimistic on parts prices. This is a by-product of my:
1.) willingness to scrounge hard at the junkyard an adapt/fabricate things to fit my needs
2.) commitment to my fifth ammendment right not to incriminate myself (my wife reads this forum at times!)

Randii