does anyone know what is required to install a full flowing spin on oil filter in a 235? ie: is any drilling in the block nesisary. I was reading a "how to" artical in Deve's antique trucks web page. and it was showing drilling near were the oil pump conected. the place I had my block machined at sayed that i could run the line going in to the filter with a tee comming out of were the oil presure sensor is. then run the return line into the theads near behind the generator but before the exhaust. just wondering if anyone knows anthing about it.