All depends on your rules and your budget, what weight class, and speed limit. Pretty tuff to build something light that can do what a 77 Ollie with a 310 can do, esp for the money.
Like Robbie said, MM's are great for interchanging parts with little or no mods required.
For the bigger stuff, esp open class, the MM's are tuff to beat. the bigger ones are like taking 3 Deere blocks, turning the engines so they face up and turning them faster RPM's.
For MPH classes, you can make about anything work, if your budget is tight, pick something with slow transmissions. HP = Force*Velocity -- takes 3 times the HP to go 9MPH as 3MPH, etc.
If you're looking at NATPA type rules, check out the results pages, that should give you an idea what's out there. Again, depends on your budget, you can drop $25-$35k in an engine if that's what you want.
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