THE STUDIO CHIEFS who signed George Clooney to twin $3 million deals before he'd ever starred in a major movie can now breathe easy: From Dusk Till Dawn's No. 1 finish suggests that ER's cutup can hack it with the box office big boys. But who's gotten the biggest booster shot here? Probably writer-costar Quentin Tarantino, ignored by audiences last month with Four Rooms. The salvage operation is also in gear for Richard Dreyfuss, lately in a cardiac-arrest phase but now electroshock hot with Mr. Holland's Opus, about $1 million behind Dawn despite a 145-minute running time that limits its showings.

TOP 20

WEEKEND GROSS WEEKS IN GROSS* TO DATE RELEASE

1 $10.2 FROM DUSK TILL DAWN Dimension, George Clooney $10.2 1 2 $9.3 MR. HOLLAND'S OPUS Hollywood, Richard Dreyfuss $9.3 1 3 $6.2 12 MONKEYS Universal, Bruce Willis $39.1 4 4 $5.4 EYE FOR AN EYE Paramount, Sally Field $14.8 2 5 $5.1 GRUMPIER OLD MEN Warner Bros., Jack Lemmon $58.2 5 6 $4.3 JUMANJI TriStar, Robin Williams $82.1 6 7 $3.7 HEAT Warner Bros., Al Pacino $58.5 6 8 $3.7 TOY STORY Walt Disney, Animated $174.2 9 9 $3.6 DON'T BE A MENACE TO SOUTH CENTRAL WHILE DRINKING YOUR JUICE IN THE HOOD Miramax, Shawn Wayans $14.1 2 10 $3.3 SENSE AND SENSIBILITY Columbia, Emma Thompson $13.5 6 11 $3.1 WAITING TO EXHALE 20th Century Fox, Angela Bassett $57.9 5 12 $2.9 BIO-DOME MGM, Pauly Shore $9.6 2 13 $2.6 FATHER OF THE BRIDE PART II Touchstone, Steve Martin $70.2 7 14 $2.6 TWO IF BY SEA Warner Bros., Sandra Bullock $8.6 2 15 $2.3 SABRINA Paramount, Harrison Ford $46.3 6 16 $2.2 DUNSTON CHECKS IN 20th Century Fox, Jason Alexander $6.6 2 17 $1.7 DEAD MAN WALKING Gramercy, Susan Sarandon $2.7 4 18 $1.4 LEAVING LAS VEGAS United Artists, Nicolas Cage $6.9 13 19 $1.3 SEVEN New Line, Brad Pitt $90.5 18 20 $1.0 GOLDENEYE United Artists, Pierce Brosnan $99.9 10

TOP 10 / PER SCREEN

WEEKEND PER-SCREEN NO. OF AVERAGE SCREENS

1 $9,571 DEAD MAN WALKING Gramercy 180 2 $6,830 LEAVING LAS VEGAS United Artists 206 3 $6,570 MR. HOLLAND'S OPUS Hollywood 1,409 4 $5,555 SENSE AND SENSIBILITY Columbia 595 5 $5,110 FROM DUSK TILL DAWN Dimension 2,004 6 $3,845 12 MONKEYS Universal 1,610 7 $3,574 DON'T BE A MENACE... Miramax 1,010 8 $3,240 EYE FOR AN EYE Paramount 1,680 9 $2,668 GRUMPIER OLD MEN Warner Bros. 1,901 10 $2,467 HEAT Warner Bros. 1,506