Are you asking how to do it or telling us you did it? If you have a high powered engine, have you considered air flow restrictions?
Here is the one my friend @Kim Strobeck made for his 31 and glued in with 2 part panel adhesive, he built the buck (positive and negative) and used his OT Ford pick up for the pressing. I think that looks pretty tight! He has a stock merc flatty, air flow shouldn't be impacted. He did a ridge down the middle that fades away near the bottom and a nice reveal around the edges.