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Heavy D is right. I've got the same truck and gears in my '68. When I ran the 350 with 4v, it was a gas hog. When it popped, I 'temporaily' put in a '77 305 with a 2v. It now does better on gas than anything I own (sad part) and ain't bad on performance. It runs so well I haven't touched the 350 and it's been almost 5 years now.
The six is REALLY gonna suck gas when you try to make it run like the 350 did. Those sixes were never know for their economy.
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'68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre
'83 Jeep CJ-7, <80,000 miles, original owner
'04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer
'95 GMC K1500 Extended cab
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