Performance vs. emissions in 1973

In 1970 the 318 was 8.8:1 compression.

In 1973 it was 8.6:1.

Not a terrible difference.

My bone stock (except for dual exhaust) 73 318 pings like hell on any more than 0* advance running 87 octane. 89 does not help, and I ain't putting 93 in a 73 318-2 motor.

Chrysler claims that dual exhaust was good for 20HP. I'd do that first.

After I get my rear freeze plugs replaced, I'm going to start base lining 1/8 mile times, and then start some mods. My goal is to keep or increase my 15 MPG and 87/89 octane requirement, while adding some useable power/torque and increasing the "fun factor".

Stage I- Eddy 600 CFM and performer intake
Stage II- comp "256" cam
Stage III- change 2.76 open to 2.94 SG (and rear ISO elimination)
Stage IV- Dakota exhaust manifolds
Stage V- "302" heads
Stage VI- "Magnum" Heads
Stage VII- 3.23 SG gears

Not necessarily in that order.