For what you plan to do I'd buy the #69730 Predator... You are not only saving money but you are gaining Cubic Inches / HP right off the bat...
Add ARC Billet Flywheel
Dyno F275 Cam
Champion Rocker System
Buy the SI Stainless Valve set 27/25cc,, Dual Spring kit if wanting to turn more than 8500 RPM's or 26lb spring kit if under..
Chrome Moly Push Rod Set
ARC #6252 Billet Rod
Predator Flat Top Piston Ass'y
Buy either a Stock Appearing 200 series Carb or 390 Blueprinted Carb and Adaptor Set.
Block deck should be fine,, cut head approx .040,, do some light porting,, but do not enlarge the runners, You will need to ream the valve guides thats in the head from 5mm to 5.5mm due to most all valves are 5.5mm stems..
Have someone tig weld the timing gear to crank (pretty Good Tack weld in 2 spots,, stops the gear from moving..
Drill oil return hole in head to approx .187 - .200 range.. No bigger
This all should get you close to what you want and at a reasonable price..