Anyone Got A Combo Like This

The problem is not a smaller engine with the heads, but the longer strokes with the heads. The ports were not developed with cubes bigger than 440 in mind. So the speeds get really high and the port goes into choke. That doesnt mean some guys can't make a combo work. I have a friend who can make 680 hp from a SS legal 351 Cleveland. That doesnt mean I or many others can make it...lol. A 3.75" stroke engine can make better numbers than a 4.15 will with them. Any porting you could squeeze into the budget will only help... As will any extra squeeze you can get.