Figure 4 in the report say best BSFC at 2000rpm to be about 0,0625mg/J. That convert to 0,3689Lb/Hp-Hr or something nearby depending on the nationality of the horses. Pretty close to that R3350 turbo compound engine.http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.527.3808&rep=rep1&type=pdf
In a study of the 1999 LS1 BSFC is graphed multiple times. Its in mg/J, have no idea how to convert to Lb/Hp-hr
But in superiorairparts.com/downloads/vantageengine/SVIOM01.pdf BSFC varies from .54Lb/Hp-Hr to .61Lb/Hp-Hr from 2100 to 2700RPM at for a 180hp motor.
The LS1 is (on page 10 of the above report) a constant ~ .035 mg/J over all RPM ranges.
0,035mg/J is 136mg/Wh, or 0,207Lb/Hp-Hr, again depending on the horses but I did not find any BSFC numbers in Figure 10 in the report.