You're current problem doesn't appear to be a "Hot Air Problem". If you have a Rod knock it is nearly identical to a Rod knock in a V6 in a 82 2bbl Regal, Sure, nobody rebuilds those anymore, but it doesn't mean they have forgotten how. You need to find an old guy who rebuilds buick motors, not a transmission shop that specializes in tuning '86/'87 Turbo Buicks,
Unbolting and bolting in a motor isn't hard. Throwing the motor in an old tire in the bed of a pickup and taking it somewhere is a lot easier/cheaper that towing a whole car around on a flatbed.
You could even haul a Buick V6 around on one of those $40 Hitch mounted racks from Harbor freight if you have an SUV and don't have a pickup.
Unbolting and bolting in a motor isn't hard. Throwing the motor in an old tire in the bed of a pickup and taking it somewhere is a lot easier/cheaper that towing a whole car around on a flatbed.
You could even haul a Buick V6 around on one of those $40 Hitch mounted racks from Harbor freight if you have an SUV and don't have a pickup.