hi i was looking to get my efi 460 rebuilt and was wanting to build it as a sand dune crawler/groceries getter/tire smoker. however my local mechanic has a fully rebuilt efi 460 out of a 1990 e350 with 15,000 miles on it it is bored .40 over with a mild cam he gave me a good price on it and am planning on buying it i however what to get the heads ported (slightly) any recommendations? i don't want to change the injectors or ignition and i still want to get fair 460 mpg like 10 and to be very driveable and i already have an air intake and headers.
im looking to get around 300/320 horses when im done thanks