Nice to hear about a true low budget, mild build for the everyday hobbiest.

I am sure a set of Edelbrock RPM or similar heads would make a bunch more power, but at an added price. That cam sounds pretty small/mild also, but not everyone wants to trade off manners below 3000 rpm for the power above that.

And instead of that 383 (3.38" stroke) crank, a 3.75" crank would add 451/406=1.11 more pull. Again, at an added cost ~$100 (regrind) to $700 (new crank).