I have a stocker with the duttweiler neck conversion. It has some
minor fan rash on the tubes (I bought it that way and used it), but
it doesn't leak pressure. It's clean inside too. Email me at 67L88Vette@comcast.net and I can send pix if you're interested.
Let me know. I'd like $150 plus shipping, and I have PayPal.
Sincerely,
John A, Turbohh