If you wanted a mild engine, you should not have went with a 347. Those things are monster power makers.

Keep your compression under 11.00 to 1 and you will be able to run on cheaper gas 89 octain, and only loose maybe 20 HP tops at the top end.

If you want to have a monster motor, but have pleasent street mannors, then put a 600 - 650 Vacuum Carb on it. That will keep it on the calmer side then a bigger carb.

Rear gears, and Automatic or Standard will also be big factors.

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What is life worth, if everything comes easy...?
66 Stang 385+ HP 306 .494 /.520 225 durr @.05, 200cc Windsor Sr's, Edle RPM, C4, 3.00 posi, 575 Annular Mighty Demon, 22 MPG,