If you have good compression, those bottom ends will handle 350hp no problem. Myna has injection pumps for sale for like $1k I believe that is a 603 pump with new elements and calibrated on his bosch fuel machine.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k