Hi Sad.
I'll share how my thought process went. The original 6 was bad so I needed a new or rebuilt engine. Being male, the first thought was the teenage dream of bigger is better! I considered Buick 455, Cadillac 500, Pontiac 389 or 400, an old chrysler 400 or 383 and more. Then I got to thinking about gas milage and did I want a muscle car or a neat old truck. Okay, I wanted a neat old truck but I didn't want the 6. So I considered the chevy 350 or the 383. But you know what, a lot of people have them. I began to think the neat old truck with a 6 might not be bad but I still haven't given up on the V8. Perhaps an old 283 or a 327, they have guts but they are not the 350. A little of both old and neat. Perhaps others will share their thought process, but that is how it is going with me!