390 vs 408

Oldmanmopar said

There is no replacement for displacement. No brainer. just make sure you internally balance that 360 so you can use a nuetral balance converter.

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Agreed. Internal balanced motors are beter. hough you can have it externally balanced, why you would is beyond me for a build like this. Ha ha ha.

The selection of balancers and converters are larger and cheper for a internal balanced engine. Quicker, easier, shorter down time / swap times.