Porting a Merc 300.

[Schiada]

After reading Mr. Brinkman's book I took it out on a Merc 300. We will see if it will work on this hotrod motor? Couldn't do all the work because the 300 doesn't have all the room that is needed. She has the 5/8" ports. So what do you think? My mill is old and so am I! LOL
Randy