Hi. There is one thing, assuming that you want to use the B30 (a terrific straight six) to go along with the longer front clip -- I have heard that you can't mate that engine to the 240's AW transmission. One reason suggested is that the B30 is straight up, and the B21, B23, etc. engines are slanted to one side, but I don't know if there're more problems as well: bolt holes (bell housing), output shaft, etc.
I think you have to adopt the B30's BW35 transmission for your project car, too (along with it's driveshaft, mounts and support piece, etc.), and that would be a major step backward compared to the AW.