A KV6 in an F or TF would be a lovely thing indeed Nodge - especially with the right kind of exhaust. A kind of "Costello" conversion for the F
There is a bit of a modification needed to the bulkhead to get it in, as I am sure you'll know. You may be able to re-shape the fuel tank, but generally, it is not too difficult to get it in.
But it is a little heavier - which can be a pain with the Hydragas units - you will probably need to invidualise them and run the rear with a higher static pressure. A little easier with TF springs as these can be replaced.
With your 160VVC conversion, are you running MEMS2J or MEMS3? I can run the car (the MGF sprint car) as either potentially - but slightly easier with MEMS2J as I already have a MEMS2J ECU and the wiring loom. Just a couple of sensors to swap over