Well, it really depends what you want from it. As Clive said, Rennys wont brap easily. You need to do massive overlap to it. However, Rennys are really difficult to port hard, cause you will hit coolant ports. I know, I have destroyd several of them just to see how far I can go
That being said, easiest and cheepest way might be, that you get low power and high power engines. Port that LP and put HPs gearing and e shaft on that LP. Do custom made intake for it and put carb or throttlebody injection.
Theres lots of options. It really comes to what you want to do it. Depending on where you live, you might have possibility to get turbo engines with desent price
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