First off "cummins, diesel"
Actually those are both proper nouns and should have leading capital letters: 'Cummins Diesel' would be correct. But this site isn't about grammar and there are some of those rules I've refused to honor for years.
Almost anything can be 'made' to fit almost anything. Over on the HAMB there is a guy putting a 4BT into similar sized Ford truck that may be a useful read.
Actually the same guy has a build thread on 4BTswaps which would be worth a review.
On OldGMCTrucks.com there is a thread about a guy who put a 6BT into about a '50 GMC 1-ton.
You haven't told us why Cummins or why Diesel. I find description of intended usage and expectation to always help in answering questions.
While I understand Diesel makes a lot of sense in many cases in others you're spending a lot of time to fit into the crowd rather than get more work done for less money.
I'm a gas guy. I even host a forum called
www.oldgastowrigs.com, but I'll be following along because I have a fascination with old trucks that actually work for a living.
