Level 1C7 pulls this off because it use a special Mode 7 game mode, the status bar is gone so the full resized images of Bowser can be seen without the IRQ line cutting it off, so it can't be done without some sort of patch. The way I found out to do this for my brother's hack is to use
LevelASM(the patch is easier for me to use than UberASM & the ASM Tool, that's just my opinion). In levelinitcode search for levelinitXX: (xx being the level you want) and type in this:
Code LDA #$59
STA $2109
LDA #$59
STA $190D
so if you wanted it on level 10C it would look like this:
Codelevelinit10C:
LDA #$59
STA $2109
LDA #$59
STA $190D
RTS
So you could use this for what ever level you want & the Status bar will be gone for the levels you put it in, however if you get a power up, it'll be floating in the middle of the screen, also I would suggest setting the time limit to zero as the time still counts down and you wouldn't be able to see the numbers.