C... I have a Mirage 15.5x17 that gave me 38mph at 4600 WOT, a little too much RPM for the 2-barrel, I now have a 15.25x19 Mirage that I hope to try soon. And yes you will have to trim a regular trim tab. I did try a 19p aluminum that gave me 4300 WOT and engine sounded happy there no lugging or overturning but it had been ground too thin and cracked. BTW timing is 5/6 degrees, pertronix and 89 non-ethanol.
If you would like to try the 17p Mirage you are more than welcome to, also have a 21p ss not sure of make it gave upper 3's in rpms.
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