The front coils/struts should be swapped out--I did a V8 (1963 Oldsmobile all aluminum 215--same weight as Volvo 4) in a 265. The front rode way too high until corrected. You're probably best off with a later B23/B230 and o'drive auto--and switching to a carb if AL regs/inspection aren't too strict. In NY cars get a rolling drum drive simulation (tough), over 20 years old get only an idle test-which the V8 passed--over 25, safety only. The 3-speed auto could work with the 4 but you'd need the proper bell housing and torque converter anyway. The stick shift trans is different in a number of ways (input shaft, shift extension, clutch lever actuation). You'll need the 4's radiator and front driveshaft, shift linkage, motor mounts and brackets. Find yourself a complete 240 to transfer parts from and scrap or sell the remainder when done--the aluminum motor and transmission (auto) and radiator can be scrapped separately at a higher rate than the bare body ($25 per hundred lbs for the "mixed aluminum" in my area--$8 for the tin). I happen to have a discontinued project -- 4 ('85 w/od auto) into a diesel 244 ('80) I'd sell cheap--but you're a bit far from Long Island. Good Luck.