Be a good idea then to vernier the port & the brass insert before attempting the job to see what the interference is.
And making sure the hole is free of rust scale & any other debris that has built up over time.
I drifted mine in place whilst the engine was in the car.
Not easy do get to, but certainly not too difficult once the firewall is removed.
regards,
Tony.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.