Re: V8 in a TY ? Opionion Please!
TY is not much lighter than the pickup you had - but a lot bigger pain to put the v8 into. You will need special oil pan, headers, radiator (siamese bore 400 will need a lot more cooling than regular v8s). Custom motor mounts, electric cooling fans, then the exhaust - to get the power out of that engine you will need something big, and also spendy.
In a general answer to your question - the v8 will go into your truck - BUT, just fix the v6 - you will be happier in the long run. If you want to put that engine in an s-10, go ahead, but don't wreck a ty doing it...