Since I gained interested in converting to carbs on my engine I've been on the look out for 45s, as these are most suited to the engine, but they are bloody difficult to find second hand. In the unlikely event that I do find some they are very expensive and/or already sold. I must have been looking for about 5 months now to no avail, but 40s are bloody everywhere and dirt cheap too. So I was thinking would it be advisable to go for a set of 40s with biggest chokes possible. I heard of an 20XE with this set up once and it made 175bhp.
I know it would be a comprimise but I see no other alternative other than buying brand new 45s.