CREATE TABLE table_52069 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

Tell me the lowest Grid for engine and driver of emerson fittipaldi with more laps than 70
SELECT MIN("Grid") FROM table_52069 WHERE "Time/Retired" = 'engine' AND "Driver" = 'emerson fittipaldi' AND "Laps" > '70'
SELECT MIN("Grid") FROM "table_52069" WHERE "Driver" = 'emerson fittipaldi' AND "Laps" > '70' AND "Time/Retired" = 'engine'