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In 1979, I had a 1966 mustang coupe with a 1bbl 200ci straight six, automatic 3spd and a 2.87 rearend ratio.
I installed clifford headers that were 3 cyl on each header then did a "y" pipe into a 2 1/4 pipe w/ a single muffler, then 'y' piped uot to the two GT exhaust tips.
I was running E-70 radial series tires on the 14inch rims.
I had purchased a trip computer from jcwhitney and got it all calibrated. (yeah I was into ecomodding in 1979!!!)
I consistantly got 28+ mpg on the road.
I had to put a rebuilt long block in and went to have it smogged (in California). the results were less than 10% of the allowable level. It barely registered on the machine.
What really surprised me was that with the rebuilt engine I could actually 'chirp' the tires on take-off.
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