Big block in a 65

[Leadfoot Lambert]

I'm trying to decide what engine to use in my 65 I have a spare 454 that needs the crank turned and new bearings, gaskets etc, with the machine shop costs and parts needed I will be looking at at least $800-$1000 to get it in and running, or I could go with a used small block for about the same or maybe less if I just buy a parts car that still runs well, What do you think? Will a big block fit within the frame rails with manifolds or am I gonna need headers? will block hugger headers work in this truck small block or big block? I'm kinda leaning to the small block because I would like to use T-5 tranny and I know it will not take the torque of the 454 for very long. whats your thoughts? this truck is going to be used daily during the good weather months and parked for the winter, it wouldn't hurt my feelings if it got reasonable gas mileage so there is another black mark for the 454. Thanks for listening to me think out loud.