Hey, no sweat, I didn't know the specs for a 68 truck and I couldn't find anything on the net, so I gave you the specs I had as a starting point. As long as it works out in the end that's all that matters. My Swinger was a CA emissions car so who knows how that might affect it.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.