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The sky's the limit on this question, I like the 460 option because of the power and torque behind it and the variety of upgrades you can do so it, I like the diesel idea, because well lets face it, It just wont quit!!, Rebuilding the straight six, is not a bad idea either because you can always sell a rebuilt six and use it to buy another engine HA HAHA
Personally I don't care for any motor with a liter designation going into a 78. I'd rather see you drop in a 350 than a liter motor, but that's just me.
The 6 is great, but you're not going to get the speed out of it. The 460 on the other hand, as they used to say, will pass everything but a gas station.
the 300 six id like to keep its the original motor that came in the truck from the factory im just not sure that it would hold up it does have 418,000 miles on it
If it were me, I'd stick with the 300 and rebuild it. Its a great motor and 418,000 k should prove that.
Thing is an I6 is athing of the past, your truck represents a piece of history. I'm an old I6 fan so I am biased in opinion. I had 2 of these trucks and I can tell you I had more trouble free fun out them than my 69 GTO hotrod I had.
the 300 six id like to keep its the original motor that came in the truck from the factory im just not sure that it would hold up it does have 418,000 miles on it
I concur with Saltbranch; 418K on that engine should tell you something right there; those babies are bulletproof reliable. Torquey too.
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