the tall deck is not going to just fall in . i have put a tall deck10.200 donovan 66 gto 620+ and a 573 this is work for a low hp 366. the short deck 9.800 is the way to go 396 to454 with bowtie block or dart or world block you get 581 with the short deck to make it work you spend big$$$$ and not get much out of it look at some of the threads on tall deck427 this will help