13s and 15mpg Magnum head 360

racingsnake440 said
fresh .030" over short block
magnum heads milled .030" and redrilled for LA style manifold
mopar performance thin head gaskets
Edelbrock LD 340 manifold
Weiand Action Plus manifold
Holley 600 and 750 cfm vac sec carbs
Thermoquad carb

Undecided on the cam, probably one of the following:
Comp Cams XE268H, Comp Cams 270H Magnum or Comp Cams 280H Magnum
Thanks

Here is what I would do:
OK fresh .030" over short block

OK magnum heads no need to mill if you can get the CR above 9.0:1

OK mopar performance thin head gaskets I would probably go with a good MLS metal gasket

CHANGE Edelbrock Magnum Performer RPM Much better manifold, same TQ, better HP, there is a also a cheaper "Crosswind" copy of the RPM with dual Bolt pattern

CHANGE Edelbrock 600 Elec/choke Carb (4106) good street carb if not drag racing, more than enough for a 318

CHANGE Hughes HEH1523AL Camshaft. Enough cam to make about 350 HP with a 9:1 comp 360ci motor, expect to get avbout an extra 1/2 point bump in compression with the magnum heads. Mild enough to have good idle and vacuum

VALVETRAIN:
Use the stock Rockers and shafts, stock pushrods should be good as long as they are straight still. Use a new set of 5001 Lifters and 1110 springs

I ran a similar 9.1:1 360 in my old Dakota with a slightly hotter 218/228 cam and mopar M1 single plane intake. It made a dyno proven 300 RWHP with the Hughes cam, It made good power and had 335 RWTQ from 1700 to 4800 rpm, flat as a table, not varying more than 10 lbft all the way accross. In a heavy Dakota with poor gearing and no weight over the rear tires it ran 13.79 @ 103 mph when the engine had over 115,000 miles on it.
360 dyno graph 301hp/335tq

You have a light car, which will work pretty well for this combo, here is what hughes recommends on this combo.
Light car, mild street: medium to heavy towing or RV. Dual exhaust or headers, 4 bbl carb. Street gearing 3.00 to 3.55:1. 150psi suggested cylinder pressure. Good idle, resto/cruiser. Hot daily driver, mileage OK.