302 heads-Is it worth putting them on a stock 318
In my opinion, the addition of 302 heads on an otherwise stock 318 is worth the effort. Slight increase in compression, slight improvement in flow, slight improvement in performance. For an additional cost, up size valves to 1.88, 1.6. The valves themselves you might even get for free, as used take outs.
If you were to do a cam, intake, headers at some point, you could have a nice little ripper and many would not be-leave its a "Teen".
The above mods are all weekend bolt on's; begin Friday night, drive Sunday afternoon.
Good luck!