1.6 rockers with stock 318 cam??

I'm with everybody here on the rocker ratio issue. Skip it.

The SP2P intake is a mileage maker. Skip it.

Look for the;
LD4B (old Edelbrock intake/square bore carb pad)
Edelbrocks Performer
Weiand's Action Plus

The cam doesn't need 1.6 rockers for a noticeable improvement. The power gain comes nearly directly from the extra duration. A small rise in lift is there to take advantage of the cylinder head flow available. Once you go beyond .450/.460 lift, the head could use (Not a must) some valve work or if a greater lift is used, some bowl work in addition. (Porting under the valve.)