getting a 250 or 292 into the 200-250 hp range is a fair shot for a daily driver. The rpm limit would be 5-6000 rpms depending on the cam(hyd cam)
dual exhaust, mild cam , updated intake, HEI.bring the compression up some over the stock 8.5-1 (9/9.5-1) And even with very Mild head work.( the very least clean up the Ports)