Cortina Model Differences

[Honro]

Hi All,

Just thought id ask question as ive read many conflicting posts both on here and other forums.

Bit of background;

Im looking to build my own V8 Cortina. Ive spoken with my engineer (in ACT), and ive been given the ok to put a 6LT (363) V8 into it. So ive decided to go with a stroked Windsor.

My question is;

What is the difference between TC 4cyl & TC 6cyl?
What is the difference between TD 4cyl & TC 6cyl?

Ive been told the firewall in some models is different, and apparently the tunnel is bigger in the 4cyl models? Can anyone please confirm any of this before I buy the car?

Thank you!