most people dont realize this, but you can get a carb to run off angle off-road. i have a edelbrock carb that will run with the truck almost laying on its side (and yes, i just heard you say bullsh!t outloud.) run a purolator adjustable FPR. they are around $25. when you go 'crawlin, set it on 2-3 lbs. yes, i said 2-3 lbs. i can do this on my bronco, and with the offroad needle/seat, it will run on its side, but will stall if it ever rolled. yes, EFI would be better, and i still plan on an FI swap later on. but there is no reason why i cant make due with what i have now.
with a slightly cammed 351W, and the pressure on 2 lbs, it will not run past 3500 rpms. but, in low range and first gear crawling, i have never needed over 3500 anyway.