Grant Springer is the most knowledgeable motor head that walks the talk in Oregon. He is truly the Oregon Guru of engine machining-hi-tech and exotic engine rebuilds. He has squeezed every bit of horsepower per cubic inch only equal to the big name guys like Ed Pink, and Keith Black to name a few. Hell put you in the usable horsepower range per your application and budget. Face it motor heads if they want theyll get the money to get the performance. Thanks Grant for the 390 FE and the 428 Fe that you built for me. You need to come back to Gladstone, Oregon