74 XB Fairmont
Join Date: Sep 2001
Location: Cranbourne, Vic
Re: ZH 351 - few questions
A 3.5 diff will help as it won't be loading up to try and move. Another reason your using more fuel is your stalls mismatched. The diff gears will alleviate most of the issues though. The extractors and a 2 1/4" twin system should be plenty. Doesn't have enough cam to need 2 1/2" pipes. That'll help fuel econ too.
Run the motor in on petrol.
To correct the speedo the gear is available over the counter at Ford or Rarespares etc.
 last thing on the list is a dyno tune.
XB Fairmont (street car) email@example.com.