Yeah I've also been using a Blizzard 1230 IV for years without any problems :-)
However, I've just used SysSpeed on it as WhichAmiga makes the A1200 freeze. I'm getting the figures CPU 68030 (51 Mhz) and FPU 68882 (177Mhz)
Isn't that 177Mhz figure a bit odd? :-?
It has two chips on it:-
MC68030RC50C
MC68882RC50A
A4000 Mad