the bm mega blower is about two inchs lower then the 671 or 871 as there no need for the carb plate to mount the carbs . i built some blower engins using the 345 just finshed i set for a hill and hole truck dart 355 heads that will use alcohol .did some offshore engines that used a smaller blower shop blower that is one i would use .you could drop the engine lower in to the car to cams i have used are about them numbers but lsa of 110