[full pull bob]

Hello. I am looking for opinions on what to use for a motor that will produce torque and hp for my stock class truck puller. It is a 1972 chev 3/4 four wheel with a manual four speed and the truck weighs a little over 5000lbs. It is geared with 4.10s, 205 t case and is running 265/75/16 tires. I have considered a 383 or to keep things simple of running a 400 going for more cubes. I also like the idea of vortec heads with the understanding that for stock heads, they pretty much outperform all previous stock sbc heads out of the box. This particular build has to handle rpms and produce of course decent amounts of power. This is what the truck will primarily do is pull, but the catch is that it has to retain stock looks, no headers, no alum. intake as to pass tech inspections once in a while. give me some ideas where to take this, thank you