hj sandman 6 to 8 engine swap

[Kingcoffee]

Hi people great site you have here
I have a survivor hj 202 all matching numbers sandman that I'm the second owner of
I've had it for a long time now and would like to swap out the 202 for a 308 maybe even 350
my question is would that hurt the value of the car or would it add more value?

Keep the 6 cylinder and put in v8 but keep everything you change of so it can go back in
As for the 350 you will need to to much work and engineer reports