we put a 360 in a 81 imp several years ago with efi,,.we used 318 heads,,lots of lo end torque top end ok but not great..millage went to about 18mpg,,it could turn the rear tires though,,speaking of starting ,,the ASD is bad about shutting down and not coming back ,,what we did is cross the 2 big supply wires (blue,green) and drove it for the next 13 years and it is still running good with over 200,000 miles and still going,,.at the time we did the 360 we also put a 727 in also,,im not a 904 fan,,efi still works good but the idle motor quit so i disconnected it and set it at 700 rpm hot..to start cold ,,just touch the gas a little..once started it will idle ,lo at first ,it gets better as it warms up,,,,..rick