This is a 90's UK design ... its scratch built, original plans are for a 40 sized plane but this is scaled to a 60. Specs are as follows:

W/span - 64"
Lenght - 54"
Chord width - 18"
Wing thickness - 2.5"
Wing area - approx 1150 sq inches
AUW - approx 6.5

Should I go 2C or 4C ... Saito 100? Was thinking of just a TT61Pro for fun fly. Any comments?

I think the Saito 100 would work well on this plane. I built the smaller version several yrs ago. It's a blast to fly. I'm not sure how it will 3D, because it is very short coupled. But, mine was a blast to fly slow and in close.
Z

With the Saito 100 it will 3D for sure ... I think I will just stick with the TT61 and use her for fun fly only. I had the smaller one before this and it was fun.