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Do a compression test and find out how much those old cylinders are pushing. I'd recommend valve seal replacement at least every five years. If you get blue smoke puffing out the exhaust on startup then your engine is due. I would also install HEI distributor if its not there already.
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1970 GMC 1500 Custom
Original 350/TH350
Victoria, BC, Canada
You can wish in one hand and crap in the other.
See which one gets filled first.
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