Definitely run a fuel regulator those fuel pump kick out 7+# I installed one on my MRL 360 delivered last fall, but I got rid of the Summit 750. I didn't care for the Holley/Autolite copy on Air Gap style intake (same as yours on the LA). I installed an Edelbrock carb, which does make as much power but it's a weekend Cruiser. The Summit Carb was pig rich blogging/sputtering at 15-20 mph. AC Plugs all carbon fouled. I dumped those plugs for NGK. Ran much better and tweaking the carb alittle richer. Edelbrock' should their tune better, but don't make as much as a Holley. I am rebuilding tuning the Carter 625 which will go on it.
I am still fighting through some gremlins since the install last fall, but getting there. Trans leak and a heater core.
Good luck with your install. I have been pleased/happy with my MRL build, but need to change the oil filter adapter fitting it's end threads are booger'd up. I noticed this after the first oil change. Summit Carb was diluting the oil. I have picked up a new adapter.