Yeah, I didn't mind my old 3.slo in my 89 XtraCab, it ran OK and got OK mileage.
In Red Chili 1, on the other hand...
All my 3.slos blew headgaskets. Red Chili 1 did, and roached a motor (it was the wife's vehicle
), before the campaign. It was an uphill battle but we got a new motor. So I could continue to live with it. Yuck.
A 3.4 in an 89-95 truck would be the very best of all possible worlds IMHO. Great mileage, good power, stone reliability, more solid front end, pickup utility.
But your decision makes lots of sense for a DD for sure.