383 RB block

OK SOMETHING YOU MAY NOT SEE FOR YEARS. a 1958/59 STD BORE 383 RB BLOCK THE BORE IN THE BLOCK ARE 4.030 X 3.750= 383. SO THINK OF TH FUN 4.030X3.90=410. CAST #1851729-5 LOOK BEFOR YOU EMAIL. THIS IS A 2YEAR BLOCK. $150.00 + SHIPPING