Replacing 1990 318 with a 1968 318 in a D150 worth it?

I have a 1990 D150 318. The plan is to install a mild cam and converter.But the truck has a loud rattle which sounds like a lifter noise. I pulled off the intake and noticed that the lifters are roller which are pricy plus this means I will have a fortune in the cam also and I'm on a budget. I have another 318 from a 1968 barracuda I was pondering over putting in the D150 and was wondering if this would be an easy swap or if anybody has ever done anything like this? And if the whole tbi system would work out on top of the 1968 originally carburated 318? Any info or advice at all with this swap would be greatly appreciated.

Thanks.

How do you plan on getting around the factory TBI/electronics to run the early 318? Id fix the 90 TBI and dont worry about a cam/ect..

That's what I was wondering. I was gonna use try the the 1990 tbi intake and carb on the 1968 318. But I was making sure this would work ok or if anyone else tried this and ran into issues.

I have a 91 v 8 dak and was thinking of doing the same thing with a 70 318

They will work with just swapping parts but why install an engine that the exhaust seats are not really compatible with today's gas & the valves will sink in Besides, why go flat tappet when you already have roller

look at the local cl i just sold a magnum 318 complete soup to nut...intake front serp setup harness starter for 250 bucks and was glad to be rid of it.

in a pinch your earlier engine will work just fine with transfer of parts from the later engine...youll be into it for some gaskets and incidentals, if moneys a big issue, your own labor doesnt cost you much so id think your better off having a running truck than one that doesnt

I pulled these lifters are and I noticed on the top of one of the lifters you can push down on it and it feels kind of soft. Would it be safe just to replace one without replacing all of them?

Bullet cams will regrind your stock roller cam for less than $150.

R.

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I pulled these lifters are and I noticed on the top of one of the lifters you can push down on it and it feels kind of soft. Would it be safe just to replace one without replacing all of them?

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Roller cams aren't sensitive to roller and cam lobe match. As long as the cam is in decent shape, its fine to replace a single lifter.