David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

MOPAROFFICIAL said
And people wonder where the legendary part of the LD series manifolds came from. The 273 pieces were chokers, you'd toss on a Ld4 and its night and day.

That would be a fun addition to their test. A LD4? should add 10-15 horsepower? What's your guess