I AM CONCIDERING UPGRADING MY INCREDIBLY SLOW BUT FUN 1979 EURO E21 316 ENGINE W/ EITHER A M42 OR M20 2.5L. THE 1.6L POWER PLANT FROM THE 1602 IS PAINFULLY SLOW(90BHP!). THE M42 IS LIGHT AND "HIGH TECH" WHILE THE M20 2.5 IS CREAMY SMOOTH.IF ANYONE HAS ANY ADVICE AS TO WHICH ONE WOULD BE THE BETTER CHOICE THAT WOULD BE WOUNERFUL. -HOW MUCH $$ AM I LOOKING AT HERE?(INCL ALL NEC.PARTS AND LABOR) THANK YOU