big block or small block

hey guys...ive got my 73 swinger on the road again..new interior from classic and legendary..front floor pans from classic....rebuilt my 8 3/4 and added superstock springs and installed in..this is an 80,000 mile car with a perfect slant 6 that will go anywhere,just not cool enough..i have a 73 duster v8 k frame with disc brakes to install...i aslo have a 79 360 hp 4 barrel motor with the windage tray and i have a steel crank 64 year 413 i think out of a fury..cost about the same to rebuild them but the big block good headers will cost a little more...cant make up my mind which way to go...what would you guys do?View attachment 1715942816 View attachment 1715942816 View attachment 1715942816 View attachment 1715942817 View attachment 1715942816 View attachment 1715942817 View attachment 1715942818 View attachment 1715942817 View attachment 1715942817 View attachment 1715942817 View attachment 1715942817 View attachment 1715942817 View attachment 1715942816 View attachment 1715942817 View attachment 1715942818 View attachment 1715942818