250 HPDI with 300 heads, etc

[87gtNOS]

08 250 with 300 heads, compression is up about 10-12 psi.
Spark plugs are cleaner than ever. Haven't run it really hard yet.
Question is, can I put the bigger 300 throttle bodies on? 46mm vs 43mm.
How about a spacer, with 43mm or 46mm throttle body?
Will all this continue to lean out this motor? I have to assume it would be safe, I think Hydrotec stuff is just bolt on and go.

300 ECU?

[87gtNOS]

My thoughts on TB spacer on a BASS boat is this......I think the main reason for it was TORQUE, longer intake makes TORQUE. The HPDI is a low revving motor, and heavy boat needs torque. Lots of people say they noticed no top end change....make sense to me.

Thoughts?
I would have to cut up my airbox to use a 1" spacer I think.