PUT a 302 C.I OR A 351 C.I.(WINDSOR) bOTH ARE A SHORT STROKE ENGINE, ALSO INSTALL A RV CAM THIS KIND OF CAM WILL LIVEN THE ENGINE AND MAKE I FAST AND YOU WONT HAVE TO CONSTANTLY TUNE IT UP AS YOU WOUL HAVE TO IF YOU HAD PUT IN A LARGER CAM.bIG BLOCKS ARE OK BUT YOU WILL HAVE TO BEEF UP THE FRONT...