Here are 5 pix of a resto bock fitted with 4.1 pistons ... but this is not my current (or siamese block). Last picture shows the lifters.. the ceramic lifters caused a huge problem and ultimately cost me the block....but I digress (and need to stop crying). BTW - I used the carcus to try and see if I could get a set of rollers in it- I couldn't do it (that is an ugly picture I can shhare only after drinking!)
New block was identical if you didn't look in at the water jackets.