Steve.
On the 289 block, there is ONLY a difference in the bell on the 63-64 289 block where it used 5 bolts.
That was eliminated by the '65 production.
The earliest version of the 289 you should see on the Mangusta is the '67 version which is a 6 bolt block. At that point there is no difference between the bellhousings.
The value to the 331 or 347 is that it is built internally on the 302 and there is NO outward sign of the modification.
There have been people looking for COMPLETELY stock Panteras all along but particularly within the last couple of years.
There are speculators that have analyized that these cars are way too cheap and are resembling the Cobra scenario with prices hovering in the 30 to 40 thousand dollar area just before they jumped in virtually one shot into the hundreds of thousands of dollar reselling.
The production numbers on the Mangusta resemble more closely the numbers on the Cobras than the Panteras do but for sure there are people with car portfolios and their managers are advising investing in these cars.
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