I ran 2 hits of nitrous on my 245 back in the late 90's. Totaled about 150hp. The motor had a set of pistons that I had gotten from Manley I believe. We adapted a set of Honda rods to make it work. I was no longer using fuel injection and had two 44 webbers and a header that I got from KG Trimning back in the day. I used an old school distributor (Vacuum advance B21 I think) and an MSD 6AL, msd 2 step and retard box. Ported head, K cam.
The car broke M46s like they were made of glass. It would destroy motor mounts,head gaskets, suspension pieces, etc. The last time I had started it it was just worn out. It was a fun car but a 1985 originally from Mass and succumbed to rust and I pulled all of the pieces and junked the car.
Now I just do turbo stuff. Power all the time and tune with a lap top.
George in DC