A500 and A518 Parasitic loss

Did you replace a 904 or a 727 when you installed your A500 ?
When you did this swap. Did you notice any lose of power (like being lower on power/Parasitic loss) while daily driving ?
Also after doing the swap. Did you notice a free wheeling effect (overdrive) at cruising speeds ? Any MPG change. What rear gear are you using. How much power are pushing through that A500 ? Sorry for all the questions. Just want to make an educated plan.

I went from the 904 to the A500 and had to cut out some of the top of the loop over the trans and mod the trans mount cross member. (NO floor mods)
Didn't notice any difference in power overall, but the A500 has a lower first gear and I noticed that big time, as it gets the car off the line a lot quicker.

No freewheeling in od or lockup either one, and went from 18mpg on the hiway with the 318/904 to 25mpg with my 350hp Magnum and A500.
Driveline had to be shortened almost 4 inches IIRC.

273 rear gears give me 2,100 RPM's at 80mph and 25mpg out on the open road on 87 fuel.
It does better with 91, but I never actually noted how much and only noticed the same amount of dollars got about the same distances.
15 inch 60 series tires on it.
When out on the interstates I normally do 80-85 for hundreds of miles at a time.

Just a fun fact, (or not):D
I can't get anywhere near lockup in CA since it comes on at 70, so doing the 55 speed limit there in OD the engine runs at about 1,500 RPM's.
I really don't like running it that low in R's, so I usually turn OD and lockup off.

I get that some would, or have to go the 200R4 route so they can just buy everything, but in my specific case I did all the work myself and had about $250 into the entire swap and that included the trans, converter, 7290 yoke, shift kit, and 80"speedo cable.