I would go with whatever the builder recommends. That way if something goes wrong, you can honestly go back to him and say "Well, I did it exactly as you asked and this is the result.". That way he can improve the process and build a better one next time.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow