New bb build fuel economy

plymouth1937 said
Thinking about building me a 400bb whid 440 crank,ending up whid 451 cui,the direction whid this build is fuel economi not performance,as this engine orignaly is a low comp engine im shooting for 9.5 ratio,any sugestions on cam pistones intake carb,this is a low budget build so cast crank cast pistons and so on,what heads are the most efficent,cast stock heads,valve angles,mild porting.....
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low compression DOSE NOT MEAN GOOD MPGS the key os turning less rpms over drives & gears . that how the new cars run soongood . u cantake a doggymotor &S makit run good out of the hole with a good set of gears if u want the most mpgs out of a motir good comptression & the right cam A GOOD RV CAM WOULD BE A GOOD PIK