1988 Toyota Supra Conversion / Advice?

I am doing a complete conversion of a 1988 Supra. I have a few pics of the new interior. Having trouble inserting them. I keep getting a script modify message.

This came with the 7M GE but I am putting a 7M GTE with turbo upgrades and more.

I put it in the shop for all new suspension:

Suspension tech. Springs (lowers 1.2"), Tokiko struts, complete set of poly bushings, front and rear sway bars.

My question is: Should I replace the trailing arms as well?

Conversion to what? Turbo? Did this really require two threads for the same question? :)