1968 k20

[tonyr0774]

Hey guys,

Looking for a little help. I have a 68 K20 that I purchased my senior year in high school some 15 years ago. The service tag states that the truck was originally equipped with a 327. Would this have been a 2 or 4 bolt main block? It currently has a freshly rebuilt 350 4 bolt main #3970010 block bored .30 over with 991 heads, 172/150 valves. Stock cam, Headers, 2&1/2 inch exhaust with dual flow masters, edelbrock performer rpm intake and carter afb 600 cfm carb. Whoever had the truck prior performed an axle swap so that I now have, what I believe to be a 71 or 72 Dana 44 front because it has disc brakes, and a gm corp. 14 bolt rear. I believe the ratio to be 4:10 as the truck is an automatic TH350/NP 205.

Given the current config. Is it worth looking for a 4 bolt main 327 or should I stick with the 350 I have? What would the stroke difference mean in terms of torque/hp and overall performance desired for a 4x4? If I stick with the current motor what are your thoughts on the heads? I've been told they are ideal for the application due to their low end torque generating capabilities and have also heard they don't breath well and are garbage. I am considering a new set of aluminum heads but would like to hear some suggestions on brand and matching cam config. Also .194 or .202?

Lastly, my column shifter needs to be rebuilt. The shifter is sticky and it is difficult to pull toward the driver to shift and is worn. What parts do I need to replace and where are they located in the column? And where in the hell does one find the lower shifter rod bushing?

Overall thoughts on current mods?