Built a lot of 390's back in my younger days . Myself i prefer a holley with vac secondaries . And depending on cam and manifold vac. then ya know what power vale to use and depending on manifold you can stagger jet accordingly . I have found that you can tweak a holley alot easier . And yes you can get fuel mileage out of them and some serious pony power and torque . Built 3 for a buddy of mine , one went into a 68 Ford F100 Ranger hooked to a 4 speed and it would run the bag off GTX's . Then we built one for him that went into his 73 F250 4x4 and he gained 6 mile to the gallon over the stock 360 then in 75 i built one for his 75 F 250 4X4 . we could get around 17-18 mpg out on the road I use the 735 CFM Holley's found on the 428's and for cams we used several different ones that were in the performance book from ford. The one in the 68 had a 427 solid cam with the 1.73 rockers and the 428 police pkg manifold . There is somuch you can do with the FE blocks if ya have worked with them . Build my first one in oct 1963 And i am here to tell she would run . While i was stationed in Ga in 67 i shell we say supplemented my PFC pay with drag racing the locals . And the one old boy that i beat three for thre came up to me and asked if all them thar cars from Ohio were this fast , told him nope this was one of the slower ones. Plum STOMPED his 396 375 by five car lengths in the quarter .
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