Fill with thin brush using a brush-on clear - you may need to thin the clear a bit with some solvent. Sand with extra-fine paper - including the surrounding area a bit - use your judgement. Brush on more clear (over the whole area) and sand again. Make sure it is VERY dry between sandings. Repeat this until the crack disappears.
SBF-331 430hp XE274HR cam, AFR 185, E-brock Pro-Flo EFI, 4into4, 3.55, TKO 600, 17\" Bullitts (255s, 315s), FFR #1004723 Namaste