I would not recommend the old 1600's if you care about consistent drivability. Size wise they're fine, but they aren't the greatest for drivability.
If you'd rather use an online generic sizing calculator then here ya go:
http://rceng.com/technical.aspx?User...6xgYyAslJPYjew
The generic numbers I use for BSFC are gasoline 0.60, E85 0.85.