two90west said:
can any chevy guy's who are familiar with the 305 ho give me any suggestions, much appreciated
Assuming your is still mostly or all original (with the computer system intact)...
As far as plugs and wires...stick with original delcos. Mine never really ran right with anything else. Accel makes a nice in-cap, high output coil (p/n 140003) and ignition module (p/n 35363). Any dress up kit designed for the SBC (valve covers, air cleaner, etc) from Summit or Jegs will work. I believe you need the drop base for the air cleaner. You could also just strip and repaint your original one... they look good if freshened up and do a better job inducting cold air than the aftermarket assemblies.
The biggest performance increase to the 305 would come from headers and a nice 2 1/2" exhaust. I have Edelbrock TES headers (although they are no longer made). I believe Hooker also made a emissions legal header (if you need to be concerned with inspections and such). Keep an eye out in the for sale section and CL. If there are no worries about emission laws, your possibilities increase substantially.
I went with the Vodoo 60101K cam and lifter kit, a double roller timing chain, new stamped steel roller tip rockers (Summit, 1.5) and new z28 type valve springs. I also had my carb rebuilt to spec by
http://www.customrebuiltcarbs.com. Contact the owner Phil and tell what you are looking for... they were very reasonable and did it quickly. From the time I shipped it to him to the time I got it back was less than a couple of weeks.
If budget allows, you could bolt on some aftermarket heads for even more HP... At that point though, it really makes more sense to look at swapping in a 350.